Core/Spells: Fix deathknight gladiator glove bonus
Closes #512
Scripts/DrakTharonKeep: update Tharon'Ja
- update Tharon Ja to BossAI
- update one creature - cosmetic npc

Closes #10524
[DB/SAI]: Digging Through Bones (10922)

Fixes #3231
Merge branch 'master' of github.com:TrinityCore/TrinityCore into 4.3.4